To simply run around in circles to level your mount, you do not need Macros, you do not need Weighted objects, just do the following.
Numpad 4 + Numlock
Numlock locks the #4 Numpad key, so with Numlock ON, you press and hold Numpad 4 so you start spinning, then with it still held down press Numlock.
This will use the auto run feature in the game, and make you run around in circles. Don't get caught using a macro program, as I believe they are banning if Hack Shield catches it.